content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import java.util.concurrent.atomic.*;
  
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
  
  /**
   * Run the Nono before switching to the Publisher and relaying its values.
   *
   * @param <T> the value type
   */
  final class NonoAndThenPublisher<T> extends Flowable<T> {
  
      final Nono before;
  
      final Publisher<? extends T> after;
  
      NonoAndThenPublisher(Nono before, Publisher<? extends T> after) {
          this.before = before;
          this.after = after;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          before.subscribe(new AndThenSubscriber<T>(s, after));
      }
  
      static final class AndThenSubscriber<T> extends AtomicReference<Subscription>
      implements Subscriber<Void>, Subscription {
  
          private static final long serialVersionUID = -1295251708496517979L;
  
          final Subscriber<? super T> downstream;
  
          final AtomicLong requested;
  
          final Publisher<? extends T> after;
  
          Subscription upstream;
  
          AndThenSubscriber(Subscriber<? super T> downstream, Publisher<? extends T> after) {
              this.downstream = downstream;
              this.after = after;
              this.requested = new AtomicLong();
          }
  
          @Override
          public void request(long n) {
              SubscriptionHelper.deferredRequest(this, requested, n);
          }
  
          @Override
          public void cancel() {
              upstream.cancel();
              SubscriptionHelper.cancel(this);
          }
  
          @Override
          public void onSubscribe(Subscription s) {
              if (SubscriptionHelper.validate(this.upstream, s)) {
                  this.upstream = s;
  
                  downstream.onSubscribe(this);
              }
          }
  
          @Override
          public void onNext(Void t) {
              // not called
          }
  
          @Override
          public void onError(Throwable t) {
              downstream.onError(t);
          }
  
          @Override
          public void onComplete() {
              after.subscribe(new AfterSubscriber());
          }
  
          void innerOnSubscribe(Subscription s) {
              SubscriptionHelper.deferredSetOnce(this, requested, s);
          }
  
          final class AfterSubscriber implements Subscriber<T> {
  
              final Subscriber<? super T> a = downstream;
  
              @Override
              public void onSubscribe(Subscription s) {
                  innerOnSubscribe(s);
              }
  
              @Override
              public void onNext(T t) {
                  a.onNext(t);
              }
  
              @Override
              public void onError(Throwable t) {
                  a.onError(t);
              }
  
              @Override
              public void onComplete() {
                  a.onComplete();
              }
          }
      }
  }
  